Static and dynamic material properties of CFRP/epoxy laminates

Zhang, Xihong; Hao, Hong; Shi, Yanchao; Cui, Jian; Zhang, Xuejie

doi:10.1016/j.conbuildmat.2016.04.003

Cited by 91 publications

(31 citation statements)

References 21 publications

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“…Three strain rate regimes are typically defined in literature; quasi-static (QS) taken as 0.1 s −1 or less, high-rate (HR) defined as 100 s −1 or higher and the intermediate zone between these values [32,[34][35][36][37][38]43]. Strain rate effects have been represented in the material definition by Foster et al [15] where the transverse modulus was scaled uniformly with increasing strain rate for example by a factor of 1.5 for a strain rate 1x10 3 s −1 .…”

Section: Influence Of Strain Ratementioning

confidence: 99%

“…Surface damage area varied by 30 and 50% respectively for heating rate and strain rate dependent material properties [15]. More generally, studies have been conducted to experimentally determine the influence of strain on composite material properties [32,[34][35][36][37][38][39][40] however significantly less have focused on the combined effects of strain and heating rates [41,42]. Zhang et al [41] experimentally compared the effects of temperature and strain rate for 3D braided composites.…”

Section: Introductionmentioning

confidence: 99%

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Coupled Thermal-Mechanical Progressive Damage Model with Strain and Heating Rate Effects for Lightning Strike Damage Assessment

et al. 2019

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This paper proposes a progressive damage model incorporating strain and heating rate effects for the prediction of composite specimen damage resulting from simulated lightning strike test conditions. A mature and robust customised failure model has been developed. The method used a scaling factor approach and non-linear degradation models from published works to modify the material moduli, strength and stiffness properties to reflect the effects of combined strain and thermal loading. Hashin/Puck failure criteria was used prior to progressive damage modelling of the material. Each component of the method was benchmarked against appropriate literature. A three stage modelling framework was demonstrated where an initial plasma model predicts specimen surface loads (electrical, thermal, pressure); a coupled thermalelectric model predicts specimen temperature resulting from the electrical load; and a third, dynamic, coupled temperature-displacement, explicit model predicts the material state due to the thermal load, the resulting thermal-expansion and the lightning plasma applied pressure loading. Unprotected specimen damage results were presented for two SAE lightning test Waveforms (B & A); with the results illustrating how thermal and mechanical damage behaviour varied with waveform duration and peak current.

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Section: Influence Of Strain Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coupled Thermal-Mechanical Progressive Damage Model with Strain and Heating Rate Effects for Lightning Strike Damage Assessment

et al. 2019

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“…In this study, the average strain rate of CFRP is 9 s −1 . When the strain rate is less than 10 s −1 , the increase of dynamic tensile strength and elastic modulus of CFRP materials is only about 3% [29,30]. Therefore, the influence of strain rate on CFRP is in dynamic debonding or fracture strain [13].…”

Section: Fracture Development Process and Failure Modementioning

confidence: 99%

Numerical Investigation on Dynamic Response of RC T-Beams Strengthened with CFRP under Impact Loading

Zhao

Kong

et al. 2020

Crystals

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To precisely evaluate the retrofitting effectiveness of Carbon Fiber Reinforced Plastic (CFRP) sheets on the impact response of reinforced concrete (RC) T-beams, a non-linear finite element model was developed to simulate the structural response of T-beams with CFRP under impact loads. The numerical model was firstly verified by comparing the numerical simulation results with the experimental data, i.e., impact force, reaction force, and mid-span displacement. The strengthening effect of CFRP was analyzed from the section damage evaluation. Then the impact force, mid-span displacement, and failure mode of CFRP-strengthened RC T-beams were studied in comparison with those of un-strengthened T-beams. In addition, the influence of the impact resistance of T-beams strengthened with FRP was investigated in terms of CFRP strengthening mode, CFRP strengthening sizes, CFRP layers and FRP material types. The numerical simulation results indicate that the overall stiffness of the T-beams was improved significantly due to external CFRP strips. Compared with the un-strengthened beam, the maximum mid-span displacement of the CFRP-strengthened beam was reduced by 7.9%. Additionally, the sectional damage factors of the whole span of the CFRP-strengthened beam were reduced to less than 0.3, indicating that the impact resistance of the T-beams was effectively enhanced.

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“…There are several research works which employ the servo-hydraulic test fixture for CFRP tensile tests and show good test results because of the constant tensile speed and stability. 12–14 Strain measurement is an important part of a data acquisition procedure for high-speed material properties. A strain gauge is in general widely employed for strain measurement which can only measure a local strain at a material point where a gauge is attached on a specimen surface.…”

Section: Introductionmentioning

confidence: 99%

Tensile properties of CFRP manufactured by resin transfer molding considering stacking sequences at various strain rates

Yoo

Huh

Lim

et al. 2019

Journal of Composite Materials

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This paper is concerned with the improvement of a tensile test method and the material properties of carbon fiber reinforced polymer manufactured by resin transfer molding considering stacking sequences at various strain rates for auto-body. Auto-body structure experiences the strain rates up to several hundreds per second during car crash. In order to apply the carbon fiber reinforced polymer panel into auto-body structures, it is critical to acquire the material properties of carbon fiber reinforced polymer at various strain rates considering stacking sequences. The tensile test method is improved for acceptable test results. Test specimens are modified for high-speed tensile tests of carbon fiber reinforced polymer in order to achieve designated strain rates and eliminate the effect from unfavorable conditions of inhomogeneity of deformation. Various types of grip tab materials are employed for acceptable failure modes. Tensile tests have been carried out with non-crimp fabric made by 50K high strength carbon fiber (NCF) and woven fabric made by a 2/2 twill pattern of 3K high strength carbon fiber (TWILL) with different stacking sequences of 0° and 90° unidirectional cases as well as [0°/90°] and [45°/−45°] symmetric cases. Digital image correlation method and force equilibrium grid method are adopted for strain and stress measurement of a carbon fiber reinforced polymer specimen during a tensile test. The material properties acquired indicate that the carbon fiber has little rate dependency, while the epoxy matrix has remarkable rate hardening at strain rates from 0.001 s−1 to 100 s−1.

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Static and dynamic material properties of CFRP/epoxy laminates

Cited by 91 publications

References 21 publications

Coupled Thermal-Mechanical Progressive Damage Model with Strain and Heating Rate Effects for Lightning Strike Damage Assessment

Coupled Thermal-Mechanical Progressive Damage Model with Strain and Heating Rate Effects for Lightning Strike Damage Assessment

Numerical Investigation on Dynamic Response of RC T-Beams Strengthened with CFRP under Impact Loading

Tensile properties of CFRP manufactured by resin transfer molding considering stacking sequences at various strain rates

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